Houghton Mifflin Harcourt

Houghton Mifflin Harcourt Company (HMH) (, HOH-tən) is an American publisher of textbooks, instructional technology materials, assessments, and reference works. The company is based in the Boston Financial District. It was formerly known as the Houghton Mifflin Company, but it changed its name following the 2007 acquisition of Harcourt Publishing. Before March 2010, it was a subsidiary of Education Media and Publishing Group Limited, an Irish-owned holding company registered in the Cayman Islands and formerly known as Riverdeep. In 2022, it was acquired by Veritas Capital, a New York-based private-equity firm.